#15907: memo001 causes compile time panic with fails with -O -dannot-lint -------------------------------------+------------------------------------- Reporter: osa1 | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.3 Component: Compiler | Version: 8.7 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- {{{ $ cd libraries/base/tests; ghc-stage2 memo001.hs -O -dannot-lint [1 of 2] Compiling Memo1 ( Memo1.lhs, Memo1.o ) [Optimisation flags changed] ghc-stage2: panic! (the 'impossible' happened) (GHC version 8.7.20181116 for x86_64-unknown-linux): idInfo val_a3pf Call stack: CallStack (from HasCallStack): callStackDoc, called at compiler/utils/Outputable.hs:1160:37 in ghc:Outputable pprPanic, called at compiler/basicTypes/Var.hs:567:34 in ghc:Var Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15907 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler